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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>鼠标移入/移出改变样式</title>
    <style>
        body{color:#fff;font:12px/1.5 Tahoma;}
        #div1{width:150px;height:150px;margin:0 auto;padding:10px;background:black;border:10px solid #000;cursor:crosshair;}
        #div1.hover{color:red;background:#f0f0f0;border:10px solid red;}
    </style>
    <script>
        window.onload = function ()
        {
            var oDiv = document.getElementById("div1");
            oDiv.onmouseover = function ()
            {
                oDiv.className = "hover"
            };
            oDiv.onmouseout = function ()
            {
                oDiv.className = ""
            }
        };
    </script>
</head>
<body>
<div id="div1">鼠标移入改变样式，鼠标移出恢复。</div>
</body>
</html>
